Micrometer-gage.



No. 783,721. PATENTED FEB. 28, 1905. E. G. GLAPP.

MIGROMETER GAGE.

APPLIATION FILED JULY 23. 1904.

ggz y a y f5@ 4|@ HB ill "'lalts Patented .February 28, MM35` Elli/VARI)C. CLAPP, UF Nfl-IOL, MASSAUl-I'Ublllllfbl.

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SPECIFICATION forming part of Letters Patent No. 783,721, dated February28, 1905.

Application led July 23,1904. Serial No. 217.775.

To all whom, t 'may concern:

Be it known that I, EDWARD (I. CLAN?, olAl Athol, in the county ol.IWorcester and State ol' lslassachusetts, haveinvented certain new anduselul Improvements in Micrometer-Gages, oi which the t'ollowing is aspecification.

'.lfhis invention has for its object to provide certain improvements inmicrometer gages or calipers looking to the quick adjustment ol themicrometer-screw in changing it trom one position to another and theregulation of the screw :lor the purpose of compensating VFor wear ofthe end of the screw and ol the ac! eompanying bearing and generally tothe convenience ot' operation and elliectiveness ol the device.

The invention consists in the several improvements which l will nowproceed to describe and claim.

Of the accompanying' drawings, forming a part of this specification,liigure l represents a side elevation oi' a micrometer-gage embodying myinvention, Fig. 2 represents a longitudinal section oiE the same. Fig. 3represents a view similar to a portion ofFig. 2, certain parts beingremoved. Fig. 4L represents a view similar toa portion of Fig. 3,certain additional parts being removed. Fig. 5 represents a side view ofthe micrometerscrew. Fig. 6 represents a sectional view olthemicrornete'r-nut. Figs. 7 and8 represent, respectively, a side viewand a sectional view ot' the means for closing the 1nierometer-m1t- Fig.9 represents a section on line 9 9 oi Fig. 2. Fig. l0 represents asection on line l0 10 of Fig. 2. Fig. 1l `represents a perspective viewof the locking ear or lug hereinafter referred to. Fig. 12 represents aperspective view ot' a part of said lug.

The same numerals of reference indicate the same parts in all theiigures.

ln the drawings, 2O represents the Usliaped lframe or body oi amicrometer-gage, the same having the usual l'iXed stud or anvil 2l,which is opposed to the micrometer-serew 22. The lranie or body isprovided with a hub 23, from which projects a hollow or tubular sleeve24;, preferably integral with the hub 23.

25 represents the micrometer-nut, which is it'ormed on one'end of a tube26 and is internally threaded to engage the threaded portion ol themicrometenscrew 22. The nut and a portion ol" the tube 2G is providedwith longitudinal slots 2T, which subdivide the nut into a series ol'spring-sections which normally springl outwardly enough to open the nutand disengage it from the micrometer-screw. The nutsupporting tube 26projects into the opening ot the hub 223 and is adjustably secured tosaid hub by means hereinafter describeifl.

2S 25) represent two tube-sections which are interposed between thenut-supporting tube 2G and the lixed sleeve or casing 24'. 'lhe meetingends ol said sections are provided with inclined 'faces 30., Figs. T andti, which are so formed and arranged that a partial rotation ol" thesection 29 will impart an endwise movement to the section 28. The outerend ot' the section 29 bears against the hub 23 and is prevented by thelatter from moving endwise toward the hub. The outer end ot' the section28 bears against a beveled shoulder 31, formed on the outer surface o'tthe nu t 25. When the section 29 is rotated in one direction, it impartsa longitudinal movement to the section 28 in the direction required tocause said section to close the nut 25 upon the micrometer-screw, thisaction being due to the cooperation of the section 2.() with the beveledit'ace 31 on the micrometer-mit. The section 2S is prevented l'romrotating by means ot' lugs 32, 'formed on its outer portion, said lugsentering slots 33, Fig. Lt, 'termed in the outer end ot' the sleeve 24.lhe section 2) is normally held by a spring 3st, Fig. l, in position tocause the closing oll the nut 25, said spring beinginterposed between anear 35, al.- iixed to the section 2S), and one end ol a recess `formedin the hub 23, the spring tending to hold. the ear yieldingly againstthe opposite end ot' said recess, so that the nut 25 is normally engagedwith the micrometer-screw.

In case it is desired to disengage the nut Jfrom the screw to permit arapid extended movement oli the latter the ear 35 is pressed by theoperatorls thumb or linger in the direction required. to compress thespring, and

so rotate the section29 as to permit the section 28 to move toward thehub 23. lhe sections o'l the nut25 are thus permitted to spring IOOoutwardly, the beveled face 3l crowding' against the section 28 andmoving' it toward the hub 23. The nut is thus diseng'aged from themicrometer-screw, and the latter may be moved freely any extentrequired.

It sometimes becomes necessary to adjust the screw of a micrometer-gageto compensate for wear at its outer` end and of the opposed end of theanvil 2l. To permit this adjustment, I connect the nut-supporting sleeve26 adjustably and detachably with the hub 23 in such manner that the nutand sleeve may be rotated in the hub to eii'ect any change 1n theposition of the micrometer-screw that may be required to compensate forwear of the parts contacting' with the work-viz., the opposed ends ofthe screw and anvil. To this end I provide the nut-supporting' sleeve 26with a two-part expansible ear composed or' sections 36 36, which areplaced side by side in a slot 38, formed in the hub 23. The sections 36are provided in their inner faces with tapering cavities 37, whichreceive the tapering head of a screw 39, which is screwed into the tube26. lV hen the said screw is turned inwardly, its tapering' head pressesthe sections 36 36 apart and causes them to bind on the edges of theslot 38, thus securing the tube 26 tirml y to the hub 23. lVhen thescrew 39 is loosened, the sections 36 36 release their frictional holdon the edges of the slot 3S and permit the rotation of the tube 26 andof the micrometer-nut formed thereon. This rotation when effected whilethe nut is engaged with the micrometer-screw causes an endwiseadjustment of the latter relatively to the nut.

40 represents the usual external tube or barrel which is affixed to theouter portion of the micrometer-screw and rotates therewith, the saidbarrel having' a graduated inner end 41, which cooperates with agraduated outer surface of the tube 24, affixed to the hub 23, as usualin devices of this character. The outer end of the micrometer-screw isprovided with a stud 42, which is surrounded by the outer portion ot'the barrel 40, the latter projecting' from the screw, as shown in Fig.2. Upon the stud 42 is titted to rotate a handle or thumbpiece 43, saidhandle being secured to the micrometer-screw by a screw 44, having areduced threaded portion engaged with a tapped socket in the stud 42 anda head engag'ing an internal shoulder in the handle 43. The handle 43 isprovided with ratchet-teeth 45 on the periphery of its inner end, saidteeth engaging' a pawl 46, connected with the projecting portion of thebarrel 40. The pawl 46 is formed on a stud 47, adapted to slide in a nutor bushing 48, engaged with a threaded orifice in the said projectingportion. The pawl is pressed inwardly by a spring 49, interposed betweenthe pawl and the nut 48, the said spring holding' the pawl in yieldingengagement with the ratchetteeth 45. The described pawl -and ratchetconnection between the handle 43 and the barrel 40 enables the barreland the micrometerscrew to which it is afxed to be rotated by a forwardrotary movement ot the handle until the end of the micrometer-screwbears on the work and the latter bears on the anvil. The form ot' theratchet-teeth is such that when the screw and anvil engage the work theratchet will slip on the pawl, so that the pressure exerted by the screwand anvil on the work is reduced to the minimum. The ratchet-teeth areso Jformed that when the handle 43 is backwardly rotated they willoperatively engage the pawl and impart a backward rotation to the barreland screw.

I claiml. A micrometer-gage comprising a trame or body, a self-openingsplit nut connected with said `frame, a micrometer-screw extendingthrough said nut, and automatic means for compressing said nut to closeit upon the screw.

2. A micrometer-gage comprising a frame or body, a self-opening splitnut connected with said `trame, a micrometer-screw extending throughsaid'nut, automatic means for compressing' said nut to engage it withthe screw, and means for releasing' the nut to permit its disengagementfrom the screw.

3. A micrometer-gage comprising a frame or body, a self-opening splitnut connected with said frame and having' a beveled face or shoulder,and nut closing and releasing means comprising two tube-sections havingcamshaped meeting ends, one ot' said sections being rotatable and theother reciprocatory, and a spring' engaged with the rotatable section,to

TOO

press the reciprocatory section against the4 vmay be rotated tocompensate for wear of the surfaces contacting with the work.

6. A micrometer-gage comprising a frame or body, a micrometer-nut havinga supporting' tube, a micrometerscrew extending' through said nut, andan expansible ear or lug secured to the tube and located in a slot inthe frame, the sides ot' said lug being' adapted to engage the side ot'the slot, and engage the tube and nut with the frame.

7. A micrometer-gage comprising' a frame or body, a micrometer-nutconnected with said frame, a micrometer-screw extending' through"fear/21 i a said nut, an outer tube o1' barrel axed to the screw andprojecting from one end thereof, an operatinghandle loosely rotatable onthe Screw' Within Said projecting end, and provided with a ratchet, anda spring-pawl connected with the projectingI portion of the barrel andengaging' Said ratchet.

In Atestimony whereof I have aixed my signature 1n presence of twoWltnesses.

EDVARD C. CLAPP.

Witnesses:

HARRY M. BUTLER, ANDREW J. HAMILTON.

